Crossmatching between Planck and Herschel data has uncovered a total of 30 high-z candidate starbursting protoclusters in HerMES & H-ATLAS. These protoclusters might be in their formation period so their study is important in characterising cluster formation and galaxy formation in dense environments. In this poster we present follow-up observations of these candidate protoclusters, using far-IR, sub-mm, optical/near-IR, and radio observations. Photometric redshift estimates and differential number counts suggest these candidate protoclusters are overdensities of sources in multi-wavelength data. On-going spectroscopy observations will confirm their protocluster membership and also gas & dust contents.